ratelimit: redesign

Description of how this works in `docs/internal/RATELIMITS.ms`.

Notable implementation changes:
- KEEP_SEND_PAUSE/KEEP_SEND_HOLD and KEEP_RECV_PAUSE/KEEP_RECV_HOLD
  no longer exist. Pausing is down via blocked the new rlimits.
- KEEP_SEND_TIMED no longer exists. Pausing "100-continue" transfers
  is done in the new `Curl_http_perform_pollset()` method.
- HTTP/2 rate limiting implemented via window updates. When
  transfer initiaiting connection has a ratelimit, adjust the
  initial window size
- HTTP/3 ngtcp2 rate limitin implemnented via ack updates
- HTTP/3 quiche does not seem to support this via its API
- the default progress-meter has been improved for accuracy
  in "current speed" results.

pytest speed tests have been improved.

Closes #19384

lib/multi_ev.c

@@ -508,7 +508,7 @@ static CURLMcode mev_assess(struct Curl_multi *multi,
     }
   }
   else
-    Curl_multi_pollset(data, &ps, "ev assess");
+    Curl_multi_pollset(data, &ps);
   last_ps = mev_get_last_pollset(data, conn);
 
   if(!last_ps && ps.n) {